石墨烯類奈米材料(GBNMs)有著優越的電子及熱傳導率，因此在環境研究及各類工程材料領域有著相當的應用潛力。過去研究多將石墨烯類材料視為傳統吸附材料，並多以表面吸附行為描述石墨烯類奈米材料與有機汙染物之間的作用。本研究提出石墨烯類奈米材料，對於有機汙染物同時具有吸附(adsorption)及吸收(partition)作用，成為獨特的一種雙重吸持劑(dual sorbent)來保留有機化合物。藉由不同有機化合物大範圍相對平衡濃度下的等溫吸附實驗數據，以及文獻數值推測出，在室溫的環境下GBNMs產生似液體的擾動，使之有如溶劑般對有機化合物產生分配作用。由於同時存在吸附及吸收的雙重作用現象，因此常規之吸附模型沒辦法符合GBNMs的數據。
石墨烯結構之GBNM，當具有大量分離單層時，除有相對較大的比表面積外，更因單層結構產生使之似液體溶劑效應，靠著吸收(partition)作用容納和共存多種有機物質，在室溫下為液體的化合物，其容納量超越了一般常見之吸附劑。另一方面，GBNMs具雙層作用之假設可清楚解釋先前文獻無法釐清之現象，例如在競爭環境下GBNMs仍具有相當高的吸附容量，及在以單位面積計算所得之吸附容量與傳統活性碳吸附劑之顯著差異。本研究透過超音波震盪，提供GBNM在不同分離單層程度的情況下之吸附吸收能力。
本研究以苯（BEN）、萘（NPL）及草脫淨（ATZ）為吸附質探討GBNMs產生吸收作用與其溶質活性(Solute Activity)的關係，並發現其之間的潛在相關性。此外硝基苯（NBZ）及2-氯苯胺（2CA）則為佐證吸收作用在不同極性化合物之間的泛用性。最後本研究探討不同型態之GBNM之間的吸附吸收作用，廣泛的溶質吸附及吸收量為GBNMs同時存在的新型吸附與吸收作用提供關鍵的說明。

Graphene-based nanomaterials (GBNMs) are considered to be a promising material in many applications. The unique sp-2 carbon layer structures of GBNMs make for their superior electrical conductivities, thermal conductivities, and specific surface areas. In this study, GBNMs is identified to be a dual sorbent for organic chemicals on the basis of the concurrent competitive adsorption and non-competitive partition for benzene (BEN), naphthalene (NPL) atrazine (ATZ), and others. Here the decoupled partition capacity of liquid BEN with a GBNM is drastically higher than that of NPL and ATZ because of the melting-point effect on the solid-solute activity or solubility.
These data suggest that the well detached relatively free graphene monolayers develop a liquid-like motion in water at room temperature, which enables them to attract organic solutes like a “solvent” in concomitance with the solute adsorption on the highly aggregated graphene phase. The dual sorption characteristic of GBNMs cannot be reconciled by the conventional adsorption model. Since GBNMs of high surface areas likely contain a large fraction of mobile graphene monolayers, thus both the adsorption and partition capacities of an organic solute with a GBNM may correlate with the GBNM surface area, as found. The unique partition effect of GBNMs enables them to withhold a large quantity of multiple organic chemicals (especially, liquids). In addition, the proposed GBNM dual-sorbent concept clarifies other unresolved observations, such as the highly concentration-dependent solute competitive effect and the highly variable “adsorbed capacities” per unit surface area of different organic solutes on a GBNM in comparison to those with a conventional adsorbent.

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